A measure of the loss of power in the signal reflected by a transmission line to a load, such as an antenna usually expressed in decibels (dB) as the logarithmic ratio of relative magnitudes of input power and reflected power.
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Printed Antenna for UHF and SHF RFID Applications: Reader and Tag Antenna's Design
Ahmed Elhamraoui (University of Hassan 1st, Morocco), Elhassane Abdelmounim (University of Hassan 1st, Morocco), Hamid Bennis (Moulay Ismail University, Morocco), and Mohamed Latrach (Microwave Group, ESEO, France)
Copyright: © 2019
|Pages: 34
DOI: 10.4018/978-1-5225-7539-9.ch009
Abstract
In this chapter, new microstrip antennas for RFID system are presented. The chapter is split into two sections. The first section deals with the design of two dual-band antennas for handheld RFID readers, and the second section is dedicated to antennas for RFID tag. In the first section, the authors describe theory and principle characteristics of microstrip antenna and the fundamentals of multiband behavior. The two proposed antennas are designed to operate in the ISM (industrial, scientific, and medical) band at 2.45 and 5.8 GHz bands. In the second section, the authors present the principles of matching techniques for tag antenna design. Then, they present two examples of tag antenna. The first one is a flexible antenna mounted on paper substrate, and the second one is designed for the identification of metallic object.